Multiplying mechanism



April 1, 1941. H, FURBER MULTIPLYING MECHANISM Original Filed Oct. 9,1935 4 Sheets-Sheet 1 A ril '1, 1941;

P H. .1. FURBER ,MYULVTIPLYING macmmsm Original Filed 001;. 9, 1935 4Sheets- Sheet 2 INVENTOR.

' April 1, 1941. J. FURBER MULTIPLYING MECHANISM 4 Sheets-Sheet 4INVENTOR. .M

\ Patented Apr. 1,1941

" UNITED ,STATES PATENT OFFICE 2,236,:95. v v I MUL'rrrLmcMEcnams HenryJewett Furber, Silver Spring, Md.

O in

1937, Serial No. 153,843

. '2 Claims. (Ol. 235-61) This invention relates to improvements inmultiplying mechanism randv the present application is av division of mycopending application rial No. 44,159, filed October 9, 1935, which is acontinuation, in part, of application. Serial. No. 723,595, flied May 2,1934. v

An objeot of this invention is to provide means for developing aproduct, whether positive or negative, and automatically to identify thequality of the product so developed.

Another object of this invention is to provide means for multiplyingquantities whether whole numbers or decimal "fractions and to providemeans for initial upward or downward column application October 9, 1935,Serial No. Divided and this application July 15,

Figure -is a view of the lower face of the disk 40 at the transmitter40.

Figure 6 is a diagrammatic view from the right of a timing arm 18 shownin Figure 1, with terminals corresponding to multiples, atwhich'circuits may be closed.

Figure 6a is a diagrammatic view of the timin am It, as shown in Figure1, with surface partially broken away, illustrating the relativepositions of electric terminals coactive with conductors-carried by saidarm.

Figure 7 is a perspective view from the right,

. showing the pathway of the arm 18 in closing The numbering andlettering of my cope'nding application Serial No. 44,159, except theserial numbers of the figures, are preserved herein. Suflicient of themechanism therein disclosed, is reproduced in the present application,to illustrate the operation of multiplication, although not necessarilyconfined thereto.-

with foregoing and other objects in view, as may appear, the inventionnow will be described in connection with the accompanying figures, inwhich details superfluous to multiplication are,

with view to cleamess, in so far as possible suppressed.

Figure 1 .is -a general diagrammatic view of the calculating unitadapted to multiplication.

' Figure 2 isa diagrammatic view of the manual controls at which thefactors are established, and

state-control means which selectively conditions the calculating unitfor positive or negative com-- putation, according to thesimilarity ordissimilarity in the quality of factors.

Figure 3 is a'diagrammatic view from the right iiii-(cuits betweentypical complementary conts. i Figure 8 is a diagrammatic view from theright, of members shown in Figure 1, which transmit motion from shaft 53to the shafts 58 and "a.

Figure 9 is a diagrammatic plan view of the shafts 5', 58a, shown inFigure 8 with members and electrical connections appertinent thereto. a

Figure 10 is a detail view from the left of the g armature 63a shown inFigure 9, with electrical connections.

Figure 11 is a side view from the left of the typical armature 82" shownin Figure 1, operative in restoring an accumulator arm to zero position.

Figure 12 is a diagrammatic view from the left of the armature 89 shownin Figures .1 and 9 cperative in clearing calculating unit. I

- Figure .13 is a diagrammatic view of a typical accumulator arm 6i withcontacts which close numeral circuits to recording apparatus.

Figure 14 is a detail view of inking ribbon for identifying positive andnegative resultants by different colors, with solenoid to shiftposition.

Figure 15 is a view of mechanism for effecting column-shift. I

Figure 16 is a viewof-the lower face of disk 40 adapted to sixdenominational accumulator orders for controlling the amplitude ofcolumnshift. a

Figure 171s a plan view of a typical disk Illa adapted-to sixdenominational accumulator orders for relaying, in-column-shift,actuating circuits and immobilizing circuits.

Figure 18 is a view of the lower face of the disk 49 with circuitsselectively to close circuits to reofthe disk 16 shown in Figure 1, withvarious,

electric conductors which pass from face to face.

Figure 4 is a diagrammatic view of the disk All wheels disclosed in theabovehlgures are toothed throughout, there being no mutilated gearings.The wires leading from the positive and negative poles of the source ZZare designated respectively as wires s+ and s-. Cables carrying aplurality of wires are indicated by heavy ments the members BI, GI", BI'(Figure 1) of the accumulator and members 6|, 6|", 6I"', fil

6|? and I'iI" of Figure 15, said members individu- V ally being termedaccumulator arms, as shown in Figures 1, 9, 13, 15, the accumulator arms6|, BI' being concealed by contact benches in Figure 1.

General description In view to simplicity and clearness thedemonstrations of multiplication which immediately follow are limited towhole numbers, operations involving fractions being subsequentlydisclosed in connection with Figures 15, 16, 17 and 18.

The quantities subject to operation, may be transmitted to thecalculating unit (Figure 1) by means of electric circuits controlled bymanual levers I, I", -I", 2', 2", 2", 'or by equivalent devices (Figure2). A master switch I is a state control which determines-the nature ofthe operation which shall be performed. The depression of the pushbutton P.2, (Figure 2) causes motion to be transmitted from an electricmotor, M (Figure 1) preferably in constant operation and revolvingalways in the same direction;

gles of displacement corresponding to quantities selected at the manualcontrols.

The relays C.II, C.I2 (Figure 1), control the dff, the middle member ofwhich is integral with the sleeve 60". The armature 62' imparts motionto the sleeve 60', in similar manner, through the transmission 61' andthe differential gearing d). The differentials df, dJ", are introduced,in order that the accumulator arms 6 I BI" may be responsive, each toquantities origmating in its own corresponding denominational order,while simultaneously absorbing the carryover from orders therebelow.

' Positioning pins 0.9", C.9"', well known to the art, are indicated inFigure 1, their purpose being to correct overdraft, and to block alateral member of a planetary gearing when the other lateral member bealone in operation. Such po-.

sitioning pins may .be employed where needed.

The orbits of the accumulator arms 6I.', 6|", BI' are each divided intotenunitary steps of 36 corresponding to'the numerals 0-9, (Figdirectionof motion transmitted to the accumulator arms SI, SI, SI from the motorM, consistently with the similarity or dissimilarity in quality of thequantities involved.

The wheel 16 (Figures 1, 3) closes and breaks, through conductors whichit carries, circuits established .at the master switch I (Figure 2) orSaid push-button is introduced, in order that I the calculating unit bebrought into operation,

only after all other controls are properly adjusted.

Referring to Figure 1, the motor M connected with the source 22 throughthe wires s+, 8-, and preferably in constant operation, imparts motionthrough the shaft 50, wheels 5|, 52, shaft 53, wheels 54, 55, 56,armature 51 and the electric clutch C.5 to the shaft 58, on which aremounted the sleeves 6!), 60", 60", carrying respectively thedifferentially operated accumulator arms 6|, 6If', 6

Motion is selectively transmitted to the sleeves 60', 60", 60", on whichare fixed the accumulator arms 6|, 6|", GI clutches 0.1, 0.1", C.'I"'which are fixed to the shaft 58, and operate respectively on thearmature 62, 62", 62'. The sleeves 60', 60", 60"

are carried by the shaft "58. The armature 62" 65" and thence throughthe differential gearing (Figure 1) by electric ure 1 3). I

Fixed on the motor shaft 50 is the electric clutch C.2 I which, whenenergized, transmits motion through the armature I4 floating in soli-,darity with the pinion I5 (Figure 1) on the motor shaft 50, to thewheel 16, fixed on the shaft 11 together with the timing arm 18. Thetiming arm 18 synchronizes in movement with the accumulator arms 6|,6|", 6|' moving, for example, through an arc of, 3.6, while anaccumulator arm SI, SI", SI' moves through an arc of 36". It is thefunction of the timing arm. 18 to close circuits, as it advances, whichselectively arrest the accumulator arms 5|, SI", SI, at angles ofdisplacement corresponding to. the quantities established at the manualcontrols shown in Figure 2 as will hereinafter be described. i

The manual control includes a series of 'levers, I, I", I, (Figure 2) atwhich to enter the multiplicand and corresponding respectively to thedescending orders, hundreds, tens and units, of the accumulator. At thelevers 2, 2", 2, operative only in multiplication, the numerals of themultiplier may be established. Further con-, trols comprise themaster-switch" I (Figure 2), the position of which regulates theelectric circuits variously active in different operations.

the cams 4, 4", 4", which in normal position support the bridges 5, 5f,5. Deflection of the levers I, I", I displaces the cams 4, 4", 4',

releasing, respectively the bridges 5', 5' 5",

which, falling through gravity, respectively close circuits over thewires 6', e", e', (Figures 2 and 1) to the electric relays 0.2, C.2,01".. These circuits parallel each the others, the relays C.2, 0.2", 0.2provoking, respectively, movement of the accumulator arms GI, 6|", BI,by motor M, as presently described.

The circuit closed at the bridge 5" (Figure 2) for example, when thelever I' is deflected, originates at thesource ZZ and passes through thewire s-, the bridge 5", the wire e' over the conductor I6 at the disk40' (Figures 1, 4), presently described, and over-the bridge 10" at therelay CA (Figure 1) to the negative pole of the relay C.2". Circuit tothe positive pole of'the relay 6.2" is momentarily completed at thebridge 49".through the wire 9, connected with the source ZZ (Figure 1)through the wire s+ when, as presently described, the push-button P2,(Figure 2), is depressed. The relay C.2"' (Figure 1) is then held instick, by circuit extending from its positive pole, over the bridges seaves a g, 3

1 carried by relay C1" t e wire 3+, back to the source 22. From thebridge 12", so closed at the relay 0.2"", circuit through the wire Itextends over the bridge It! at the relay 0.20, shown with parts brokenaway in Figure 1, and in entirety in Figure 9, to the positive poles ofthe clutches 0.5, 0.50, circuit to the negative poles of which may beselectively controlled by the master-switch I (Figure 2) or otherwise,as hereinafter described. Circuit is closed, in the accumulation ofpositive quantities, to the negative pole of the clutch 0.5 (Figure 1)which transmits motion in clockwise direction to the accumulator armsGI, 6|, 6I"". During the accumulation of negative quantities, circuit isda ed to the negative pole of the clutch 0.5a; and the that whentheclutch 0.5 is energized and the a shaft 58 is rotated by the motor inclockwise direclaim, the shaft 58a is rotated in direction oppositethereto; and when the clutch 0.5a isenergized, and the shaft 58a isrotated in clockwise direction, the shaft. is rotated in directioncpposite to clockwise. The shaft Sta carries transmission largelysimilar to that carried by the shaft 58; and is provided with anadditional clutch 0.8a shown in Figure 9, with broken shaft in Figure1,- which operates as presently described when energized, the clutch 0.5(Figures 1, 9)

clutches the armature 51 constantly revolving,

40 cumulator arm GI",

and receives motionin clockwise direction, which it imparts to the shaft58, on which are fixed the electric clutches 0.1", 0.1", 0.1. Retractionof the plunger of the relay 0.2 (Figure 1), for example, as herebetoredescribed, closes, at bridge 12", a circuit through the wire 1 to theclutch 0.1". This circuit originating at the source 22,

passes through the wire s+ over the bridge 13'" through the wire :i"" tothe clutch 0.1 and, thence, through the wire 8- back to the source 22.

- The clutch 0.1 so energized, clutches and rotates its armature 62",which is fixed together with the accumulator arm il", on the sleeve Inthe same manner and through similar circuits, the relays 0.2", 0.2,controlled respectivelyby the levers I", I, close circuit at the bridgesl3", l3, through the wires 1'', :i', on the clutches 0.1", 0.1(Figurel), whose negative poles are connected with the wire and whichtransmit,- respectively, motion to the accumulator arms CI", 6|, throughthe right lateral and middle members of the differential gearings DI",DI.

- The left lateral members of these last said gearings floatrespectively on the sleeves tl", Cl, and receive the carry over, asabove described, from nextlower denominational orders, permittingthereby, the simultaneous operation of all orders of the calculatingunit. Transmission j from the units order,'at shaft 58, to the tensorder, 18 by the clutch CJ'" fixed t sleeve 'I'",

geared armature 3, gears 4'', 6i" fixed on shaft '5', to diflerentialDf; and'from tens to hundreds order, the corresponding members, clutch0.8.", geared armature '2'; gears 54, i6 fixed on shaft 65' anddiflerential Df. The re- 75 lays 0.2, 0.2 close, at bridges 12", I2,circuit through the'wire h to the clutch 0.5, in common with the'relay0.2, or in negative multiplication involving reversed motion, to theclutch 0.5a. The accumulator arms 6|, GI", il" when set in motion, areseverally and respectively arrested at angles of displacement determinedconjointly by the levers I, I", I'", and 2', 2", 2", (Figure 2).Extending past all levers I, I", I-"', are

the multiplicand wires b'-b, corresponding re-- e spectively to thenumerals 1 to 9.' Extending past all levers 2, 2", 2" are the multiplierwires u a, corresponding respectively to the numerals 0 to 9. The wiresb'-b are shown as connected with terminals at the bench 80 opposite thearm I8 and as carried in a cable bb, to the levers I, I! III!- levers I,I", I'", be manually deflected, circuits are closed upon selected 1)wires (Figure 2) whence current flows through the levers I, I",

I'" and the wires 0', c", c'" (Figures 2, 1) re- I b vely. to-uie relaysc.|', 0.4", c.4'", the connections being similar at all the levers I,I',

Let lever I" (Figure 2), the wire c' and 'the relay 0.4" serve as anexample. If the quantity corresponding to a multiplicand be 3; the leverI' is deflected, so that'circuit is thereby closed from the wire b tothe wire c carried by the lever I', and thence to the relay 0.4". Itisthe function of the relay 0.4" when its circuit be completed at thetiming arm It, through a wire, say for example, the wired correspondingto the multiplier 1, and wires b 0 to break, at bridge 1", circuit torelay 0.2", causing the reent example to three units. Theaccumulatorarms SI", SI may be similarly and respectively arrestedthrough the action of the relays 0.4, 0.4 which break circuit to theclutches 0.2",

0.2 at the bridges II, It. 1

The moment at which the relays 0.4 0.4,

0.4" shall break, respectively at bridges Il,

ll, 10" circuit to the relays 0.2, 0.2;, 0.2",

istimedbythetimingarm I8 (Figures 1,6, 6a, 7) which is rotated as abovedescribed, on the shaft- The timing arm I8 carriesa series of conductorsll, 'l9'--ll which revolved in concentric arcs Progressive distancesfrom its axis by the timing arm, may close circuits between variouspairs of terminals fixed, at the sides of its pathway'upon benches; Theposition and the pathway of arm "'Il, between two typical benches tll,80' is indicated diagrammatically in Figure 7, a space interveningbetween complementary fixed terminals as shown in Figure 6a, and theradii of the respective arcs being such as to insure escapement betweensuccessive terminals (Figmultiplier may be established at the levers 2',2", 2"; closing in similar manner, circuit on the wires a-a', whichextend severally past all the levers 2, 2", 2", and which are shown ascarried in the cable ac to concentric groups'ofterminalsatthearm"(Figures1,6). Since, when themultiplier and themultipli- According to the angle at which such cand consist of severalnumerals, each numeral of the multiplicand must be multiplied by eachnumeral of the multiplier; successive partial operations becomenecessary. Although multiplica- 1 tiplier; and simultaneously switchesat the disk 40' (Figure 4) the circuits corresponding to all numerals ofthe multiplicand to successive lower orders of the accumulator, in orderthat the partial products may fall in descending columns. Assume theoperation 26x23=598. In later disclosures descriptive of Figure 15,means are provided whereby a multiplicand such as 26 and multiplier 23may be set up at the levers I". l', 2", 2 (Figure 2) corresponding tothe tens and units orders; and the first-partial operation ofmultiplication be automatically shifted into the hundreds orders of thecalculating unit, causing the numerals oi the product 598 to fall intheir proper orders. To like eflect, in order that the numerals of theproduct 598 may fall in their proper orders, the multiplicand 26 and themultiplier 23, for purposes of present illustration, may be respectivelyset up at the levers l, I", and 2', 2", the disks 40, and 40 being shownrespectively in Figures 4 and 5, in position to accommodate theoperation. Deflection of the levers l, I", releases the bridges 5', 5"and closes thereby circuit through thewires e, e" to the relays 0.2,(3.2" (Figure 1).

The first numeral 2 of the multiplier is established, at the lever 2'(Figure 2). so as to close circuit on the wire a, and the secondnumeral, 3, at the lever 2", so as to close circuit on the wire 09. Themaster switch I, is placed in position 2: when the multiplicand and themultiplier are of the same quality; and the push-button R2 is depressed.were the multiplier and the multiplicand not 0! the same quality, themaster switch 1 would be placed in position :0 as hereinafter described.

Closed by the master switch I through the contact plate 9, is circuitthrough the wire dr (Figures 2, 1), leading normally over the bridge 88depressed at the relay C. to the' negative pole of the clutch 0.5.. Anextension of the wire dr leads also to the negative pole of the relayC12. Closed by the master switch I (Figure 2) at the contact plate 12,is circuit; through the positive wire 0 (Figures 2, 1) whi t thetransmitter 40 (Figure 1) is progressively closed at the disk 46 (Figure5) on the wires 0', o", 0" leading over bridges at the relays 0.29, C0.21"} (Figure 2) to the levers 2'. 2'.', 2'". Cloeedlikewise by themaster switch 'I at the contact plate 12, is circuit from the wire s+through the. wire in (Figures 2, 1) leading through theconductor 82 atthe wheelfli (Figures 1, 3) to the relay C12 (Figure 1); and alsocircuit from the wire s+ through the wire 2: (Figures 2, 1) leadingthrough the conductor 81 at 1 (Figure 1) completes circuit through thepositive wire a. which directs initial impulse through the conductor I!(Figure 3) at the wheel 16 (Figure 1) and the bridges 49, 49", 49", tothe relays (1.2, Q2" and C.2'. Operation follows, the pushbutton beingheld in depressed position by the solenoid (3.26" (Figure 2) aspresently described.

The wires b-b are shown in Figure 6, as entering the orbit of the timingarm 18, in vertical direction and extending towards its axis in the formof spirals. The wires a'a traverse the wires b'-b in concentric arcs,the wire a being farthest from the axis of the timing arm 18, and thewire a, the least remote. At each traverse point of the a and b wires,are complementary terminals. superimposed in Figure 6 and exposed inFigure 6a, between which circuit may be closed through the conductorsIV-19 carried at progressive distances from its axis by the timing arm18. A contact 19 is indicated at arm 18 in Figure 6, which is notoperative in multiplication.

I Depression of the push-button P.2 (Figure 2) ime ps.-

SI", 61" (Figure 1), when the timing arm II advances to one and toanother of the terminals of the wires b'-b, which may be closedon thewire a through the conductor 19'. The terminals oi the wires b'-b attheir intersections with the wire a in the orbit of the conductor 15",are at arcs twice as great; the terminals of the wires b'-b at theirtraverse points with the wire a are at arcs three times as great; andthus progressively the terminals of the wires b'-b which may be closed,through the conductor 19, on the wire a, being at arcs of 32.4", ninetimes greater than the arcs between the terminals at which circuit maybe closed by the conductor I9.

II, accordingly, the are described by the arm II in advancing to one andto another traverse point of the wires b'-b with the wire a. correspondto one step displacements of the accumulator arms 6|, 6|", 8| (Figure1); the are described by the timing arm 18 (Figure 6) in advaneing toone and to another of the traverse points of the wires bb with the wiresa being twice as great, would correspond to two step displacements ofthe accumulator arms 6|, 6|", M (Figure 1). Similarly the are describedby the timing arm 18 (Figure 6) in passing to one and to anothertraverse point of wire. a being three times as great, would correspondto three step displacements of the accumulators 8|, SI", SI' (Figures 1,13); and the arcs to and between intersections at wire a being ninetimes as great, would correspond to a displacement 0! theaccumulator-arms 6|, 8|", lil' oi Therefore, it the wire a be closed atthe lever 2' (Figure 2) and the wire I) be closed at the lever I, theaccumulator arm 8| (Figure 1) would be displaced four steps,cor'responding to the numeral 4, when. arrested by completion of thecircuitby the conductor 19 (Figure 6) to the relay CA (Figure 1). as thetiming arm 18 reaches the traverse point of the wires a, I) (Figure 6).

Similarly, if the wire a be closed at the lever 2" (Figure 2) and thewlreb be closed at the lever l", the accumulator arm 6|" (Figure 1)would be advanced eighteen steps, when arrested at completion of circuitto the relay 0.4" by the conductor 18, at the traverse point of thewires respectively, from the shaft 58 to the accumulator arms 6|, ii".Motion is transmitted to the timing arm 18 from the shaft 58 through theclutch 0.21 and transmission ll, i5, 16, I], hereinbefore described. Asthe arm I8 adv circuit is completed through the conductor 19*, at.

the traverse point of wires'a', b, (Figure 6) to the relay 0.4(Figure 1) which breaks circuit at the bridge 18' to the relay 0.2, andarrests the accumulator arm ii at a displacement of four steps. As thetiming arm 18 advances further, circuit is completed by the conductor I9through the wires a, b", (Figure 6) to the relay 0.4" (Figure 1); andthe accumulator arm GI", having described an entire revolution, isarrested at a further net displacement of two steps, a tenth stepcarry-over correspondtransmitter 40 (Figure 1) switches at the; disk ll(Figure 4) the current of the wire e togetherwi the current ofthewirec', both closed by the lever I (Figure 2) and corresponding tothe first numeral of the multiplicand, from the relays 0.2, 0.4,respectively, to the relays 0.2", r

0.4". In similar manner, at the disk ll (Figure 4) current of the wiree", together with current from thewire c", closedby the lever l" andcorresponding to the second numeral of the multiplicand, are switchedrespectively from the re,-

lays 0.2", 0.4", to the relays 0.2", 0.4" (Figure 1).

Through the action of the transmitter 40, the operation ofmultiplication is accordingly shifted to the next lower orders of the,calculating unit ing to the complete revolution of the accumulator armGI" being transmitted to the accumulator arm 6| (Figure 1) of thehundreds order, through the clutch 0.8" and transmission 63", 64', 65',66', Dj', Bil. The accumulator arms 6|, 6|", accordingly, reflect thenumerals 5 and 2, as the resultant of the first partial operation.

Rotation of the timing arm 18, initiated by the wire g is maintaineduntil it reaches normal perpendicular position as represented in Figure6,

- by current through wire 10 (Figures 3, l) to the positive pole of theclutch 0.2i (Figure 1) This circuit originates at the source ZZ andpasses through the wire s+ (Figures 1, 2) contact plate l2, the wire 10,the conductor 82 at wheel .12 (Figures 1, 3), the bridge at the relay0.22

(Figure l) energized through the wire 10, to the clutch 0.2L Thenegative poles of the relays both 0.2L 0.22 are connected through thewires swith the source ZZ. The purpose of the relays both 0.22 and 0.23,is to prevent interference of circuits through the wires 9, a and in,each of which, though indiflerent instances, closes circuit on theclutch'C.2l.

Immediately before the timing arm ll reaches thenormal position shown inFigure 6, circuit is closed by the conductor 21 at the disk 16 (Figures1, 3) through the wires 1', 3, (Figures 2, 1) to the positive pole ofthe clutch 0.25 fixed to the shaft 52. (Figure 1). This circuit oriinates at the source ZZ, and passes through the w re s+. (Figures 1. 2)the contact plate l2 (Figure 2), wire :r' (Figures 2, 1), conductor 27(Figuresfl, 3) and wire 1:, to the clutch 0.26 (Figure l), whence itback to the source 22.

A y The clutch 0.26 so energized and in continuous rotation, clutchesthe transmitter 41) which floats upon the shaft 53, andoperating on thewires 0', o", 0" (Figures .1, 2, 5) as presently described, shiftscurrent from the wire 0, after passes through the wire- 8 correspondingto next lower denominations.

The transmitter 40, as shown in Figure 1,

comprises six disks 40', 40 I0 It, It, the disks 40 I0 40 being operatedonly in division. The disk 40 carries at its lower face (Figure 5), aconductor 4| towhich is attached a contact 42. Closed on theconductor 4|is the wire 0 (Figures 5, 1). Closed successively by the contact 42, asthe disk 40 is rotated, are the wires 0', o", 0", which lead eachrespectively over the upper bridges at the relays 0.29, 0,29", 0.29"(Figure 2) normally closed to the levers 2', 2", 2'. The are of theconductor 81 at the wheel I6 (Figures 1, 3). is exactly sufficient tosustain current to the clutch 0.26 (Figure 1) while the clutch 0.26displaces the transmitter 4|) from the position at which the contact 42(Figure 5) closes on the wire 0', to successive positions at which itcloses on the wire 0", and then on the wire 0". Circuit is therebyshifted downwards after the first partial multiplication, from the,lever 2' (Figure 2) and the wire a corresponding to the first numeral?of the multiplier, into connection with the lever 2" and the wire acorresponding to-the second numeral of the multiplier and eventually,were there three .numerals in the multiplier, likewise to the lever 2"".

The disk "'(Figures 1, 4) carries a series ductors at the faces of thedisk Ill, float terminals of theseveral wires 0, e, c", e", c'", e'",through which, in normal position current is directed to the relays 0.4,0.2, 0.4", 0.2, 0.4", r

0.2" (Figure 1)'through extensions of the wires 0', e, c", e", c'; :e'",leading-respectively from the opposite extremities of the concentricconductors W46. These last said terminals are spaced at arcs, whichpermit current through the 1 several wires c, e, c","e", c'", e" to beswitched respectively, to the corresponding relays of next lowerorders,as the clutch 0.26 (Figure 1) displaces progressively the transmitter40. I 7 Circuit 0 being shifted, by thetransmitter II at the disk llfmmthe lever 2' (Figure 2) closed on the wire a corresponding to the firstnumeral of the multiplier 23, to the lever 2" closed on the wire acorresponding to the second numeral thereof, andthe c and e wires havingbeen switched at the disk 4 to corresponding relays of next lowerorders, permitting the de 'fiected levers I, I", to operate respectivelythe first partial operation, from the lever 2' closed on the wire a?corresponding to the first numeral of the multiplier, to the lever 2",closed on the wire a. corresponding to the second numeral of themultiplier. Simultaneously, the

thereon; the' wheel ll (Figure 1) revolving, again momentarilycompletes, at the conductor- (Figures 1, 3) circuit through the. wire 0(Figure 1) to the relays 0.2", 0.2" and the multiplicand 26-ismultiplied by the numeral 3,

pressedby the solenoid 0.22".

The circuit of this solenoid 0.28" originates at On these conthepush-button 2.2 (Figure 2) being held de the source 22 (Figure 1), andpasses through the wire (Figures 1, 2) the conductor ll at the disk 40(Figures 1, 5), the wire 11 (Figures 1, 2) the bridge 32", the solenoid0.28" (Figure 2) and thence back through the wire 3- (Figures 2, i) tothesource ZZ. Circuit to the solenoid 6.2!" remains active, untilmultiplication is flnally completed, when, after sucessive shifts at thetransmitter 40 (Figure 1), the wire 11 (Figure 5) is thrown into opencircuit, as current from conductor 4i advancing, fails. Circuit to thesolenoid (1.28 is thereby broken and the push-button P.2 is restored tonormal position by the action of a spring 3.34" (Figure 2).

The second partial operation having been initiated by impulse throughthe wire g as circuit is again completed through the conductor 85(Figure 3), to the relays (2.2", 0.2", (Figure 1). The wheel 15(Figure 1) and the timing arm 18 enter on a second revolution; the wirea corresponding to the second numeral 3 of the multiplier, in turnoperating on the wires 1), b", corresponding to the multiplicand 26. Asthe timing arm 18 (Figures 1, 6) advancing, closes through conductor 19the wire aiupon the wire I) the accumulator arm 6|! (Figure 1) isarrested at an advance of six steps, which added to its original netdisplacement of two steps give the accumulator arm iii" an angulardisplacement of eight steps. The accumulator arm BI" is in turnarrested, as the'timing arm 18 reaches the terminals of the wires a 1)(Figure 6) and, having described a complete revolution, rests at a netdisplacement of eight steps, the ten units corresponding to the completerevolution of the accumulator arm ii' being transmitted as carry-over tothe accumu-.

lator arm 6|", which is thereby advanced an extra step. The finaldisplacement of the accumulator arms 8|, H, il' reflects accordingly,598, the product.

Should a zero appear in the multiplier, and consequently a partialmultiplcation be suspended;

transmission of motion from the shaft 53 (Figure 1) to the shaft 58, isinterrupted, by breaking the circuit of the wire it to the clutch C5.This is (Figure 1) and solenoid 0.2;" (Figure 2), the

accomplished b means of the relay C.l. Said relay C.l is in a circuitwhich originates at the source ZZ and passes through the wires 3+, 0 andwire 0', o", 0" (Figures 1, 2) already traced, progressively to thelevers 2, 2", 2" (Figure 3) ashereinabove descibed, and thence throughthe wire a over the bridge at the relay 0.3 (Figure 1) to the positivepole or the relay C.I, the negative pole whereof is connected throughthe wire back to the source ZZ. If the wire a be closed at the lever 2',2", 2" (Figure 2) which at the time be receiving current from a wire 0',o", 0",

the relay C.l (Figure 1) breaks at the bridge carried at the upperextremity of its plunger, circuit through the wire it to the clutch C5,or as it may be in negative multiplication to the clutch (3.51:. Ifthere be successive zeros in the multiplier, action at the relay C.l, isrepeated.

In order to insure the presence of the arm ll in normal perpendicularposition as shown in Figure 6, when initiating an operation inmultiplication, the push-button P. (Figure 2) is manually depressed. Itis held in such position by the solenoid 0.28 on which circuit isthereby closed and which is held in stick, through a current which,originating at the source ZZ (Figure 1) passes through the wire 8(Figures 1, 2), bridge at thepush-button P. (Figure 2), the wire z(Figures 2, 1), conductor 83 (Figure 3) at the wheel 10 (Figure 1) tothe positive poles of the relay 6.2!

negative poles whereof, are connected through the wire swith the sourceZZ (Figure 1). The relay 0.2!, so energized, transmits motion throughthe transmission 14, 15, l6, 11, until, as the timing arm ll reachesnormal perpendicular position (Figure 6), circuit to the clutch 0.2! andthe solenoid 0.28" is broken at the conductor 83 (Figure 3), arrestingthereby the timing arm 18 in normal perpendicular-position (Figure 6),and releasing the push-button PA (Figure 2) In order to provide that thetransmitter l0 (Figure 1) be in normal position, when initiating anoperation of multiplication, the conductor 43 (Figure 5) carried at thelower face of the disk ll (Figure 5), closes circuit on the positivepole of the clutch 0.26 (Figure 1). When the shifts of circuit incidentto the operations of multiplication have been completed, such finalshift carries the extremity of the conductor 43 into contact with thefixed terminals 44. The circuit so closed by the conductor 43 originatesat the source ZZ (Figure 1), and passes through the wire 3+ and theconductor 43 (Figure 5) to the positive pole of the clutch 0.26 (Figure1), the negative pole whereof, as already stated, being connected.through the wire 8-, back to the source ZZ. The clutch C.26 soenergized, clutches the transmitter 40 and rotates it onward to normalposition, the arc of the conductor 43 (Figure 5) being such that whenthe transmitter reaches normal position, circuit to the clutch (3.26fails.

Multiplication of mixed quantities-positive and negative In operationsof multiplication ,when a negative quantity enters with a positive, themaster switch I (Figure 2) is placed in position a:(). In this positionthe master switch I closes the same circuits, as in multiplication ofquantities of similar quality, except that through the'wire i a positivecurrent is closed at the contact plate l2 (Figure 2), to the relay C.lI, over the bridge 20!, and the bridge Ill at the relay 012, which isenergized, as hereinbefore described, by the wire dr. The relay C. soenergized switches at the bridge 2!, current from the wire dr to theclutch Clo which transmits motion in direction opposite to clockwise, ashereinbefore described, to the accumulator arms 6| 6|", il' (Figure 1).The operation is similar in all particulars to the multiplication of twopositive quantities or as it might be of two negative quantities, exceptthat the direction of motion of said arms is reversed, carry over, aspresently described, being effected by the transfer clutches 0.8, C3",during each tenth step and borrowing during each first step, in whichever direction from zero position the accumulator be initiallydisplaced.

The product in multiplication is automatically added or subtracted,according to its positive or negative quality, to or from any quantitywhich the accumulator II, M", H' (Figure 1) already may reflect. Shoulda positive quality, for example, be already latent at the accumulatorsH, II", II'" (Figure 1) and, the factors being of dissimilar quality. agreater negative product be transmitted thereto: the quantity reflectedat the counters 8|, 8|", il'", would first be reduced automatically tozero by operation in the nature of subtraction; and on passing throughzero, operation would follow in the nature of addition, until thenegative resultant be completed.

Referring to Figure 9. the shaft Ila carries the sleeves la, "a", "a"which are rotated respectively by the clutches 0.1a, 0.1a", 0.1o"

carried by the shaft 58 and rotated by the motor M through the clutches0.1, 0.1", 0.1. Circuit is closed simultaneously at the bridges l8, Ila,respectively (Figuresl, 9) through the wires '.simultaneously with thesleeves so', so", or",

1'', id, to the clutches 0.1, 0.1a. Circuit is closed simultaneously atthe bridges '18", 18a", through the wires a', in", to the clutches 0.1",

- 0.10"; and circuit is closed simultaneously, at the bridges 13'",-13a'", through the wires 1"", ia,

to the clutches 0.1, 0.1a'", the negative poles" of the clutches 0.1,0.1a, 0.'|",-0.-'|a, 0.1",

0.1a' being all connected through the wire s with the source ZZ.

The armature of the clutch 0.1a isthe geared wheel 62a (Figure 9)whichfloats on the shaft through a composite'idler not shown but similarto the idler 61' (Figure- 1), and the diflerential dfa' (Figure 9) themiddle member of which is 880 and transmits motion to the sleeve 68a','

is borrowed throughout ascending orders of the circuit controller, atshaft 58a; and the armature 68a (Figures 9, 10) is displaced 36 indirection opposite to clockwise.

The terminals ofthe wire do are in such position relative to thepositive contact bands 88a, 88a", 3811", which extend through36, that ifa clutch 0.8a, 0.8a 0.8a be displaced from zero in clockwise direction,as in the subtraction of a-positive quantity, a quantity is borrowedthroughout fixed to the sleeve 60a. The armature of .the

clutch 0.1a" is thegeared wheel 62o", which floats on the shaft 58a andtransmits motion to the sleeve 60a" through a composite idler similar toidler 61" (Figure 1), and the differential din." (Figure 9), the middlemember of which is, flxed to the sleeve 60a". clutch CJa' is the disk6211" fixed to the sleeve 604'. a

The carry-over, at the shaft 58a, is transmitted fromv the sleeve 6011""to the sleeve 804", by the clutch 0.8a' integral with the sleeve 68a,the geared armature 63a floating on the shaft 88a and transmissionsimilar to the pinion 64" (Fig ure 1) pivot 65", and the pinion 66", tothe left lateral member of the differential dfa" (Figure 9) which floatson the sleeve 68a". The carry-over is inlike manner transmitted from thesleeve 68a" to the sleeve 60a, by the clutch 0.8a" fixed to the sleeve68a", the geared armature 83a" and transmission similar to thetransmission 68', 65', 66 (Figure 1), and the differential dfa (Figure9), theleft lateral member'oi which floats on the sleeve 60a. i

Integral with the sleeve 60a is a clutch 0.8a (Figures 1, 9) similar tothe clutches 0.8a",

' 0.8a'" which transmits carry-over to a denominational order consistingof a single member, the

armature 63a. This'order is higher" than the highest order of theaccumulator and corresponds to thousands, in the present drawings. Thearmature 63a carries aconductor 90 (Figures 9; 10)

The armature of the ascendingorders at-shaft 88a, and the armature 88ais displaced 36", in clockwise direction, (clockwise movement in Figure10 being towards the left, because of viewpoint).

So long as operations remain within the zone of positive quantities, thearmature 88a, dis-. placed in direction opposite to clockwise, closes Icircuit from the wire s+ through the conductor 88,

which-governs duplicate circuits to the clutches I positive contactbands 36", 36", being broken 1 atthe bridge 92*, and the circuit of thewire d v to thep0sltive contact bands 38", 38'" being broken at thebridge 82*. The clutches 0.8",

- 0.8", may then be displaced from zeroin either directionwithoutborrowing and thereby displacing higher orders. The contact bands36",

36'", 38", 38'", extend each through 36 of are.

When the accumulator is at zero, circuit is carried by the armature 83a,to the'wire it. So long as operations be within the zone of negativequantities, the armature 63a, displaced in clockwise direction, closescircuit from the wire s+ through the conductor 88, to the wire (1'.

When the wire d is closed by the conductor 80, circuit is completed tothe relay 0.25, the negative pole of which is connected through the wiresback to the source ZZ, The relay 0.28 so energized retracts the plunger8|, common to the relay 0.25, and closes at the bridge 82, circuitthrough an extension of the wire d to the terminals cooperative with theclutches 0.8", 0.8", the contact bands 36", 86' which are so placedrelatively to the terminals of the wire d, that the clutches 0.8", 0.8"are energized at each tenth space displacement clockwise in everyrevolution, and at such tenth space displacement transmit a positivecarry-over. At each first-space displacement in opposite directionwithin the zone of positive quantities the clutches 0.8", 0.8", borrow.So long as operation remains within the zone of positivequantities', thewire d is active.

When the wire 41' is closed by,the conductor 90, circuit is completed tothe relay 0.25, the negative pole of which is connectedthrough the wire8" back to the source ZZ. Therelay 0.25 soenergized, retracts the'commonplunger 81; and closes at the bridge 82* circuit through an extension ofthe wire d to the clutches 0.8", 0.8", the con act bands 38", 88 atwhich, are

' so placed relatively to the terminalsof the wire d, that the clutches0.8", 0.8", are energized at every tenth space displacement in everyrevolution'opposite to clockwise, andat such tenth space displacementtransmit a negative carryover. At each first space displacementclockwise, within the zone of negative quantities, the clutches 0.8",0.8", borrow. So long as the operation remains within the zone ofnegative quantities, the wire (1' is active.

When thewire d is active, circuit is broken at the bridge 92 from thewire 8 to the wire do, which remainsopen, and is closed at the bridge82' from the wire 11 through the wire da tothe clutches C.8a',-C.8a0.8a', which, so

long as theoperation remains within the zone of positive quantities,borrow while the clutches 0.8", C.8' are transmitting positive additivecarry-over; and transmit carry-over, while the 0.8", C.8' are additivelytransmitting negative carry-over; and transmit carry-over, while theclutches 0.8", 08'' borrow.

The initial step displacement as the'circuit controller passes from zeroposition, into either positive or negative quantities, causes borrowing,as above described, at the clutches C.8a, 0.8a", C.8a, whichdisplacesthe armature 63a. Conversely, as the circuit controller returns to zeroposition, through either positive or negative quantities, the last unitdisplacementof a clutch C.8a',

0.8a", C.8a', causes a carry-over to be transmitted to the armature 63a,which is thereby in addition to the accumulator arms 6|, BI",

61", corresponding to hundreds, tens and units, the accumulator arms6|", 6|", 6|, corresponding to tenths, hundredths and thousandths; the

restored to normal position, throwing the wires d, d, and the clutchesC.8", C.8"' again into open circuit; and permitting the bridges 9|, 9lagain to close circuit from the wire s through the wires both do and do,to the clutches 0.8a, 0.8a", C.8a"".

As hereinbefore. disclosed, the direction of movement at the accumulator(Figures 1, 9) is conditioned by the master switch 1 (Figure 2)accordingly as the factors be similar or dissimilar in quality. If therebe a quantity already latent at the accumulator, to which the product beadded, or from which the product be subtracted; the quality of the netresultant is distinguished according to the direction of displacement ofthe disk 63a (Figure 10), which when the resultant is negative closesthe circuit of the wire I d to the solenoid 0.64 (Figure 14),causingsaid solenoid to elevate an inking ribbon 233 of dual color, andidentify the quality of the quantity in red. If the resultant, bepositive, the said solenoid remains inactive,- and the quality isidentified in black. The extension of the wire d designated as wire d",is shown in Figure 1 which leads to he solenoid 0.54. If the accumulatedquantity be positive, the tep displacement of accumulator arms readsfrom zero to the right; and to the left, if negative. Relays such as0.41 (Figure 13) are energized by the Wire 11', when negative, and soshift numeral circuits such as af -af that-the steps may be measuredserially from 1 to 9 and not by complementary numerals, whichever suchdirection he.

- Column shift initial column-shift to denominationally higheror lowerorders, preparatory to computation of the product at selectiveaccumulator members, and the eventual identification ofitsdenominaticnal recorded value by a decimal point.

electric button l5 at the master switch 1, which are similar inprinciplehowsoever many denominational orders it may comprise; and furtherdescription is accordingly limited to the automatic assignment ofresultants to their proper columns, and their operation relatively tothe position of the decimal point.

In multiplication the circuits closed at the levers |-l." are shiftedupwards or downwards as many orders as the first digit of a multiplierlies to the left or to the right of the units order. Products arethereby developed in their proper denominational orders, atcorresponding orders of the calculating unit; assigning the decimalpoint thereby to its proper place.

Identification of the highest denominational order of a multiplier isaccomplished by means of the wires are, (Figure 15), leading to bridgesat the levers T4, the circuits of these wires being closed at the masterswitch 1.

The outer extremity of the master switch i is provided with a button l5.When the master switch I is advanced to position (x), the button I5 ismomentarily depressed closing and immediately breaking at the terminalM8 the circuit of the wire sx leading from the source 2.2, to variousmembers, as now shall be described. The wire ax on which circuit is soclosed through the contact plate II from the wire sr+ passes first toand over the bridge 220', at the lever 2, and

thence, to and over the bridges HEW-22D" at the levers 2-2 The bridges220 220 are normally supported by the cams 22l-22|", fixed to the shaftsl8'l 8" of the levers 2'4", and are released, each when itscorresponding lever be deflected. So released, the bridges 220'420", infalling, close respectively circuit on the Wires aa:'aa:"; of which onlythe circuit closed at the highest deflected lever becomes active; sinceeach bridge in falling, breaks the circuit of the wire or to all bridgestherebelow. The circuit amam" which thus is active, identifies thehighest order of the multiplier and, by energizing as presentlydescribed the clutch 0.26, operates the required shift of circuits atthe transmitter 40:: which shall cause the first numeral of aproduct, tofall in proper column. At lever 2", corresponding to the units order,the bridge 220" breaks circuit without closing one. Since, if the firstdigit of the multiplier be of the units order; no shift of circuits isrequired.

Let the operation 3l.17 23.2=723.144, be as- ,sumed as an example. Theproduct is 723.144, of

which the numeral 7 should fall in the hundreds order, the numeralsfollowing thereon falling successively in the orders therebelow, and thedecimal fraction always assuming its position to V the right ofthedecimal point, howsoever many decimal orders there may be.

The first numeral of the multiplicand in the present example, isestablished, by deflecting the lever I" (Figure 15) corresponding to thetens order of the accumulator members, and the relevers therebelow. .Themaster switch 1 is placed in position (in) (Figure and circuit ismomentarily closed at the terminals M8, by depression of the button IS.

The highest order at which circuit is closed by the levers of themultiplier is the tens order; and the wire am" is rendered active, thecircuit of which passes to the positive pole of the relay,

0.42", the negative pole of which, as are the' negative poles of. allthe 0.42 relays, is closed on the wire sr.

The relay 0.42" energized as the button I5 carried by the master switch1 is momentarily depressed, retracts its plunger; and is held in stickthrough the higher bridge at the relay 0.42" by current from the wireson; closing over its lower bridge, current from the wire s.1:+ to thewire car" which leads to the conductor 226" (Figure 16) carried'by thedisk 4!! (Figure 15), from which conductor 226" current is transmittedto the positive pole of the clutch 0.26 (Figure 15) through the wire eatfrom the terminal 221 (Figvures 15, 16) common to all the ea: wires.Circuit is completed to the negative pole of the clutch 0.26, in suchoperation, through the wire s1:-

- closed at the master switch 1. The clutch 0.26

so energized and constantly revolving, clutches and rotates thetransmitter 40a and the disk 40, to an angle of displacementcorresponding to the arc of the conductor 226" (Figure 16). Such angleof displacement, as shown in Figure 16, is 324, beingsuch, that thewires c",'e"' (Figure 17) normally closed by the lever i" to the relaysto lower levers as successive partial operations are shifted downwardby'the transmitter 464:.

The initial shifts of the c, e, o circuits havin been effected, thepush-button R2 is depressed, breaking at thebridge 34" the circuit ofthe wire szctothe negative pole of the clutch 0.26

(Figure 15), and closing the circuit of the wire 9, as hreinbeforedescribed, to the relays 0.2'0.2 The operation of multiplicationfollows, and in the example 31.17X23.2=723.144, the first numeral 7 ofthe product, is reflected at the accumulator number 6| corresponding tothe hundreds column; with descending numerals following in order.

If the operation were 400X.002=.8; the lever l' corresponding to thehundreds order is deflected to establish the multiplicand; and the lever2" corresponding to the thousandths order is deflected, to establish themultiplier. The first 0.4", 0.2" (Figure 1) of thetensorder, are

switched to extensions of the wires 0', e', (Figure 15) leading to therelays 0.4, 0.2, of the hun dreds order, the c, e, circuits at lowerorders being simultaneously switched at the disk 40a, each to the ordernext above. The first partial multiplication is thereby shifted from thetens to the hundreds order of the calculating unit,

and the first numeral of the product is developed at the accumulator arm6|. Should acarryover he developed, it would automatically betransmittedto an eventual next higher accumulator arm, in manner hereintoforedescribed, the

quantity so transmitted being, nevertheless, gen-,

der upwards, the circuit of the wire 0 is switched denominatio'nallyupwards in like measure at the disk 4M (Figure 18) breaking circuit tothe units lever 2" 'and closing circuit on the wire 0" to the lever 2"corresponding to the order of the digit of the multiplier is threecolumns to the right of the units column. From the lever 2", the circuitthrough the wire as" is closed to the relay 0.42" which completescircuitthrough the wire er" and the conductor 226' (Figure 16) to the clutch0.26. The wires 0', e are thereby shifted downwards to the relay 0.4",0.2 (Figure 15) at the tenths order, this three order shift of themultiplicand downwards corresponding to the number of columns at whichthe highest significant digit of the multiplier .002 falls to the rightof the units column. Accompanying this shift of the c, 0 wires threedenominational orders downwards, is a shift of the, circuit 0 threeorders downwards, switching current (normally closed on the wire 0'"),to the wire 0'! leading to the lever 2. The resulting quantity isdeveloped at the tenths order, and the product is .8.

Were the operation .02x400=8; the levers i 2' (Figure 15) would bedeflected, and the. c, e

circuits of the multiplicand .02 would be shifted upwards twodenominational orders to the units order, these two orders upwardscorresponding to the number of columns the highest digit of themultiplier 400, falls to the left of the units 601- umn.

The wire 0 would be switched upwards two denominational ordersin likemeasure, current thereby being closed from the wire 0 to the wire 0'leading to the lever 2,. The resultant 8 would be developed at the unitsorder; and the numeral 8 would be reflected in the units column.

Depression of the push'button R2, after shift of'circuits, the operationof mu1tiplication breaks the circuit of the wire sr, to the clutch 0.26,and relays CAP-0.42", at the bridge 34".

It is, as hereinbefore described, a function of f the conductor 43(Figure 18) to operate in restoring the transmitter 40 to normalposition. To prevent premature action by the conductor 43, the circuitleading from the terminals .44 to the clutch 0.26 is-broken by the relay0.61 until coinputation be completed. The relay 0.61 is in a circuitwhich originates at the source ZZ (Figure 15) and passes through thewire 8", contactplate l2, wire 0, conductor 4| (Figure 18), wire 11,relay 0.61, and the wire s,'back to the source ZZ. The last shift ofcircuits, in operation of multiplication, as,conductor 81 (Figure 3)closes tens, and the first numeral of the present multiplier. In similarmanner, the wire '0 will always close circuit, during the first partialoperation, to the lever 2'4", corresponding to the first digit of themultiplier; closing circuits progressively circuit, as hereintoforedescribed, to the clutch 0.26, carries the conductor 4| beyond-the tar--minal of the wire 0, and closes circuit from the conductor 43 to theterminals 44. The relay 0.61 releasing its plunger completes circuit tothe clutch 0.26, and the 'arc of the conductor 43 is such that circuitto the clutch (2.26 is maintained until the position of the transmitterIla is restored to normal.

Restoration of the calculating unit to zero position Depression of thepush button P5 (Figure 2) closes a circuit which originates at thesource ZZ (Figure 1) and passes through the wire s+ (Figures 1, 2) thebridge at the push button P5 (Figures 2, 9), the wire n tothe relay0.19, (Figures 2, 9), best shown in Figure 9, and over the upper bridgeon the plunger thereof, to the relay C10, circuit being closed from thenegative poles or the relays both 0.19, 0.2!, through the wire a, back.to the source ZZ. The relay 0." so energized retmcts its plunger; and,when completing circuit at its upper :bridge to the relay 6.2!; closesat its lower bridge circuit to the negative pole of the relay CA2, andto terminals at the plunger 0! the relay C. l 2'. The relay Cl" breaks,

at the bridge 161, circuits through the wire it (Figure 1) to preventinterference of circuit with the shaiit SI, circuit of the wire 11 isopen at the conductor 90 (Figure 10); the relay 0.11 (Figure 9) closesat the bridges I05, I 06, depressed, circuit through the wires 11'closed by C." at lower bridge and through n, to the negative andpositive poles of the clutch Ciia, and moti shafit 58 is opposite toclockwise. It a quantity accumulated at the shaft 58 be negative: thewire d is active as hercinbeiore described, and enersizes over thebridges 92, I, the relay CJI', which is then held in stick over thebridge I by current through the wire n. The relay 6.12 so energized,closes at the bridges i", I" raised, circuit to the clutch 0.5; andclockwise motion follows at the shaft 58.

Responsive to the clutch 0.6, and floating on the shaft. 58, is thearmature '9 (Figures 1, 12)

which carries a conductor I12, extending. except at a slight arc,throughout the circumference of the disk. Momentary depression or thepush button R5 (Figure 2) imparts initial impulse to the clutch 0.5 or(7.5a and 0.6. Th clutch C. or

0.5a revolving, transmits motion to the shafts 58, 58a; and the clutchC5 clutching and revolving the disk 89 causes the conductor I12 (Figures1, 9, 12) to close a circuit from the wire s+ extended from the sourceZZ, which holds the relays C.'l-9,'C.'2ll in stick, and sustains currentto the clutches (2.5 or C.-5a and 0.6, alter the initial impulseimparted through the push button P45.

' The conductor I12 (Figure 12) is of such are as to sustain currentthroughout a. single revolution of the shaft 58, this being suflicientto restore to zero position, the members of .the calculating unit.

The clutches 0.1, 0.1", C.1", 0.1a, Clio",

0141' (Figures 1, 9) are active, in restoring to zero position theaccumulator arms 81', 81", 61 and such other members at the shafts 58,58a, as may be displaced. The clutchw 0.1, 0.1", 0.1", are energized torestore members on shaft 58, by circuits of the wire n which pass of therespectively, over the bridges ill, I10, I" at the relay C. (-Elgure 1)and conductors I13, I13", "3'", circuits being completed from thenegative poles oi the clutches (2.1, (1.1", 0.1" through wires back tothe source ZZ. The conductor at all orders is substantially alike.Referring to Figures 1, 11, conductor "3'", for example, extendsthroughout the circumference of the member 92" except at a slight arc,at which, it the member as" and the accumulator arm il'" be already atzero position, circuit is open to the relay 0.1" (Figure 1). If .theaccumulator arm U'" and the member 63" be displaced; circuit iscompleted through the conductor 113" to the clutch 0.1", whichclutching, in manner hereinbeiore described, the member 62", transmitsmotion to the member '2', until circuit to the clutch 0.1" isbroken'atthe conductor m'f'.

as the accumulator arm 81' and the member 02!" reach mem The accumulatorarms 6|", I

are restored tozero position, by circuits similarly closed and broken,leading to the clutches 0.1", 0.1" (Figures 1, 9). The members carriedby the shalt "a may be restored to zero position in similar manner, byextensions of the wire n leading respectively irom the bridge lfla atthe relay C." shown in entirety in Figure 9, to the clutch C.1a"', fromthe bridge 110a .to the clutch 0.10:": and from the bridge =l1la to theclutch C.1a'. Conductors similar to the conductor 1113" (Figare 11) arecarriedby the disk 6211", and by the middle members of the planetarygearings die", die, which break circuit respectively to the clutches0.10", 0.10", 0.1a, as the sleeves 8011', "a", la reach zero positioncorresponding members of fractional denomination may be restored bysimilar means to zero position.

During the restoration to zero; circuit to the clutches CJ", CJ', CJG",C.8d", through the wire d:- is. broken at the lower bridge at the relay0.40, and the carry-over mechanism is inactive, except as to the clutch0.8a whose negative pole is connected with the wire s", and whichrestores to normalposition the armature 830'.

Having now fully described my invention and its manner of operation, Iclaim:

quantities one by the other, a rotary timing arm, conductors carried bythe timing arm at progressive distances from its axis and displaceableby the timing arm in concentric arcs, selective numeral circuitscorresponding to a multiplicand, selective numeral circuitscorresponding to a multiplier traversing the circuits corresponding tothe multlpllcand in the arcs of said conductors. spaced complementalcontacts in the circuits at the points of traverse, means angularly todisplace the timing arm between the complemental contacts from zeroposition to cause a said conductor to close circuit between thecomplement-cl contacts of the selected factor circuits, the points oftraverse being so placed that the degree of angular displacement of thetiming arm from zero position to the traverse point of the selectedfactor circuits is proportionate to the product of the numerals to whichthe last said circuits correspond.

2. In an electrically actuated calculating apparatusfor multiplication,an accumulator comenergize the clutches, digital circuits correspondingto the numerals of the multiplicand, digital circuits corresponding tothe numerals of a multiplier, immobilizing circuits and devicescontrolled by last said circuits, means including a progressive timingmember operative from zero position and synchronized with theaccumulator members for closing a said digital circuit corresponding toa selective numeral of the multiplier on the digital circuitscorresponding to the numerals of the multiplicand for selectivelycompleting the immobilizing circuits to energize said devices andbreakthe actuating circuits to deenergize the clutches when operativeinvariable degree according to the products of the multiplicand numeralsmultiplied by said numeral of the multiplier.

3. In an electrically actuated calculating apparatus for multiplying oneby the other quantities whether positive or negative, an accumulatorcomprising members corresponding to decimal orders and angularlydisplaceable in respective opposite directions. to accumulate a positiveor negative product, denominational clutches to operate the members,means to render the clutches efl'ective at the zero point of a cycle andincluding actuating circuits corresponding to v the orders of themultiplicand to energ zethe clutches, reversible driving means foroperating the clutches to add or subtractthe accumulated product fromany previously accumulated quantity latent in the accumulatoraccordingly as the said quantity and the accumulated product be similaror dissimilar in quality, digital circuits corresponding to the numeralsof the multiplicand, digital circuits corresponding to the numerals ofthe multiplier; immobilizing circuits and devices controlled by lastsaid circuits, means including a progressive timing member operativefrom zero position and-synchronized with the accumulator membersfor'closing a digital circuit corresponding to a numeral of themultiplier on the digital circuits corresponding to' the numerals of themultiplicand for selectively completing the immobilizing circuits toenergize said device and break the actuating circuits to deenercuits toenergize said devices and, break the actuating circuits to deenergizethe clutches when operative in variable degree according to the productsof'the multiplicand numerals multiplied by a said numeral of themultiplier, a transmitter provided with switch elements, a clutch tooperate the transmitter, means including a conductor synchronized withthe timing member to energize last said clutch' after partialoperations, severally to close the circuits corresponding to thesuccessive numerals of the'multiplier and shift the said actuating andimmobilizing circuits, into cooperative connection with the accumulatormembers of progressively lower orders to cumulate a final product.

5. In an electrically actuated calculating apparatus for multiplyingquantities involving whole numbers or decimal fractions, an accumulatorcomprising members corresponding the decimal orders, denominationalclutches to operate the members, means to render the clutches efiectiveat the zero point of a cycle and including actuating circuitscorresponding to the significant orders of the multiplicandto energizethe clutches,

digital circuits corresponding to the significant numeralsof themultiplicand, a digital circuit corresponding to the numeral of amultiplier, immobilizing circuits and devices controlledby last saidcircuits, means including a progressive timing member operative fromzero position and synchronized with the accumulator members and providedwith contacts operative on -terminals paired in decreasing radii atincreasing angles to close the digital circuit corresponding to thenumeral of the multiplier on the digital circuits corresponding to thenumerals of the' multipiicand "for selectively completing theimmobilizing circuits to energize said devices and break the actuatingcircuits to deenergize the clutches when operative in variable degreeaccording to the products of the multiplicant numerals multiplied by thesaid numeral of the multiplier.

6. In an electrically actuated calculating apparatus for multiplyingquantities involving whole numbers or decimal fractions, an accumulatorcomprising members corresponding todecimal orders, denominationalclutches to operate the members, means to render the clutches effectivegize the clutches when operative in variable ratus for multiplication,an accumulator comprising members corresponding to decimal orders toaccumulate a product, denominational clutches to operate the members,means to render the clutches effective at a zero point in a cycle andincluding actuating circuits corresponding to the orders of themultiplicand to energize the clutches, digital circuits corresponding tothe numerals of the multiplicand, digital circuits corresponding'to thenumerals of the multiplier, immobilizing circuits and devices controlledby last said circuits, means including a progressive timing memberoperative from zero synchronized with the accumulator members to close adigital circuit corresponding to" a selective numeral of the multiplieron the digital circuits corresponding to the numerals of themultiplicand for selectively completing the immobilizing cirposition andat the zero point of a cycle and including actuating circuitscorresponding to the significant orders of the multiplicand to energizethe clutches, digital circuits corresponding to the significant numeralsof the multiplicand, digital circuits corresponding to the significantnumerals of the multiplier, immobilizing circuits and devices controlledby last said circuits, means including a progressive timing memberoperative from zero position and synchronized with the accumulatormembers to close a selective digital circuit corresponding to a numeralof the multiplier on the digital circuits corresponding to the numeralsof the multiplicandforselectively completing the immobilizing circuitsto energize said devices and break the actuating circuits to deenergizethe clutches when operative in variable degree according to the productsof themultiplicand numerals multiplied by a said numeral of themultiplier, and means for columnshift comprising a transmitter providedwith switch elements, av

clutch to operate the transmitter, means including selective conductorsof different amplitude and a denominational circuit corresponding to theinitial significant numeral of the multiplier 1 2 ing to said initialnumeralot the multiplier, and said actuating and immobilizing circuits,upwards or downwards into cooperative connection with the accumulatormembers denominationally higher or lower than the orders of themultiplicand, commensurately with the denominational value of saidinitial significant numeral 0! the multiplier above or below the unitsorder.

- 7. In an electrically actuated calculating apparatus for multiplyingquantities involving whole numbers or decimal fractions, an accumulator-comprising members corresponding to decimal orders, denominationalclutches to operate the members, means to render the clutches effectiveat the zero point of a cycle and including actuatin: circuitscorresponding to the significant orders of the multiplicand to energizethe clutches, digital circuits corresponding to the significant numeralsof the multiplicand, digital circuits corresponding to the significantnumerals of the multiplier, immobilizing circuits and devices controlledby last said circuits, means including a progressive timing membersynchronized with the accumulator members operative from zeropositionand to close a selective digital circuit corre- M spending to anumeral of the multiplier on the digital circuits corresponding to thenumerals oi the multiplicand for selectively completing the immobilizingcircuits to.energize said devices and break the actuating circuits todeenergize the clutches when operative in variable degree according tothe products of the multiplicand numerals multiplied by said numeral oithe multiplier, and means for column shift comprising a transmitterprovided with switch elements, a

clutch to operate the transmitter, conductors corresponding to variabledegrees of column shift, and means including,a denominational circuitcorresponding to the highest significant order of the multiplier closedto a said conductor to energize the last said clutch and cause thetransmitter to switch the digital circuit corresponding to the initialsignificant numeral oi the multiplier, the said actuating circuits andthe said immobilizing circuits, upwards or downwards into cooperativeconnection with the accumulator

